drm/i915/selftests: Fix spelling mistake "initialiased" -> "initialised"

There is a spelling mistake in a pr_err error message. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231209230541.4055786-1-colin.i.king@gmail.com

drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c

@@ -504,7 +504,7 @@ static int igt_dmabuf_export_vmap(void *arg)
 	}
 
 	if (memchr_inv(ptr, 0, dmabuf->size)) {
-		pr_err("Exported object not initialiased to zero!\n");
+		pr_err("Exported object not initialised to zero!\n");
 		err = -EINVAL;
 		goto out;
 	}